Euro & Oval profile locks that don't come with inbuilt key mechanism instead can have euro cylinders inserted.

Architectural Euro Deadlock £23.94	Chubb 3C26 Hook Bolt Case High Security Euro cylinder mortice Sashlock cases. £48.95
ERA Euro Deadlock ( 225/325 Euro Deadlock) £12.20	ERA 223/323 Oval Deadlock £12.20
ERA 263/363 Euro Deadlock £37.74